What is Masonry Mortar? What does it do? What are the main technical properties of masonry mortar?

Masonry mortar. When the strength of the masonry mortar test block is accepted, its strength qualification standard must meet the following requirements:

The average compressive strength of the mortar test block of the same acceptance batch must be greater than or equal to the cubic compressive strength corresponding to the design strength grade; The minimum set of average values of the compressive strength of the same batch of mortar test blocks must be greater than or equal to the times of the cube compressive strength corresponding to the design strength grade.

Note: For the acceptance batch of masonry mortar, there should be no less than 3 groups of mortar test blocks of the same type and strength grade. When there is only one set of test blocks in the same acceptance batch, the average value of the compressive strength of the group of test blocks must be greater than or equal to the cube compressive strength corresponding to the design strength level.

The strength of the mortar should be subject to the compressive test results of the test block with standard curing and an age of 28d.

Sampling quantity: each inspection batch and not more than 250m

The mortar of synthetic masonry is the mortar of masonry. The difference between it and plastering mortar is that it has certain strength requirements.

The scattered block sticking mortar belongs to ordinary mortar, which is generally represented by the strength code M; The strength grades of masonry mortar are M20, 5, and4 Eight grades, different water-cement ratios, different strengths!

The role of mortar in masonry:

1) The masonry is bonded into a whole according to a certain masonry method.

2) After the mortar is hardened, each layer of bricks can evenly spread the pressure through the mortar, so that the masonry is evenly stressed.

3) Mortar fills the gap of the masonry, which can prevent ventilation and play the role of warmth and insulation for the house.

The main technical properties of masonry mortar include:

1. Liquidity.

The fluidity of mortar, also known as consistency, refers to the nature of the flow of mortar under its own weight or external force. The fluidity of the mortar is determined by a mortar consistency meter, expressed in the degree of immersion (in mm). Mortar with a large degree of immersion, good fluidity.

The fluidity of the mortar should be selected according to the type of mortar and masonry, the construction method and the climatic conditions. Generally speaking, plastering mortar, porous and water-absorbing masonry materials, dry climate and manual mortar should have greater fluidity; And masonry mortar, dense masonry materials, mortars for cold climates and mechanical construction, the fluidity should be less.

2. Water retention.

The water retention of mortar refers to the ability of the mortar to retain moisture. It reflects the performance of whether the constituent materials are easy to separate in the process of parking, transportation and use of the freshly mixed mortar. Mortar with good water retention is not easy to lose water, easy to pave into a uniform mortar layer, and has good adhesion to the substrate and high strength.

The water retention of the mortar is measured with a delamination tester and expressed in the degree of delamination. The delamination degree of mortar is 10 20mm, the delamination is too large (>30mm), the water retention is poor, it is easy to segregate, and it is not convenient for construction and quality assurance; The delamination is too small (<10mm), and although the water retention is good, it is easy to shrink and crack, which affects the quality.

Masonry mortar is a type of construction mortar.

Construction mortar classification.

1. Classification of uses.

Masonry mortar, plastering mortar, waterproof mortar, decorative mortar, etc. 2 according to the cementitious material: cement mortar, lime mortar, mixed mortar (including cement lime mortar, cement clay mortar, lime clay mortar) and fly ash mixed mortar.

Purpose 1 cement mortar is suitable for masonry in a humid environment or water, and its strength grade is generally not less than m10

2. Lime mortar is suitable for masonry in a dry environment, and its strength grade is generally not greater than M103 cement mixed mortar is suitable for masonry that is relatively dry but has certain requirements for strength.

1.According to the different compositions, mortar can be divided into cement mortar, lime mortar and mixed mortar.

Mortar is a mixture of cementing material, fine aggregate and water. The cementing materials commonly used in mortar are cement, lime, etc. Natural sand is the most used for fine aggregates, and sometimes it can be replaced by fine slag.

2.Cement mortar and mixed mortar can be used for masonry in a humid environment and masonry with high strength requirements, and only cement mortar is generally used for foundations.

3.Lime mortar should be used for masonry in a dry environment and masonry with low strength requirements, and should not be used for masonry in a humid environment, because lime is an air-hard material, and in a humid environment, lime paste is not only difficult to harden, but also dissolves and disperses.

4.Mortar mixing is generally made with a mortar mixer, which requires uniform mixing. For the newly mixed mortar, it is required to have good workability.

In order to improve the workability of the mortar, facilitate the construction operation, and improve the fullness of the masonry mortar joint, inorganic or organic plasticizers can be incorporated into the mortar. The lime paste for the preparation of mixed mortar and lime mortar should be filtered through a screen and matured in the ash tank for no less than 7 days, and it is strictly forbidden to use dehydrated and hardened lime plaster.

5.The mortar should be mixed and used as soon as it is mixed. Cement mortar and cement mixed mortar must be used up within 3h and 4h respectively after mixing; If the maximum temperature exceeds 30 during construction, it must be used within 2h and 3h after mixing.

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The technical properties of pro-masonry mortar are as follows:1. Liquidity.

The fluidity of mortar refers to the performance of masonry mortar to flow under its own weight or external force, which is expressed by consistency. The size of the mortar consistency is expressed in millimeters (mm) of the depth at which the cone of the mortar consistency measuring instrument sinks into the mortar. The deeper the cone sinks, the greater the fluidity of the mortar.

The fluidity of the mortar should not be too large. If you don't, the strength will decrease, the fluidity of the analyzed water will be small, the mortar will be dry, the work will be inconvenient, and the gaps in the ash will be difficult to fill. Therefore, the newly stirred mortar should have the required consistency.

2。Water retention. Water retention refers to the ability of a mortar to retain water.

Mortar with poor water retention, in the process of transportation and placement, is easy to leak water segregation, lose fluidity, is not easy to lay a uniform thin layer and moisture, is easy to be absorbed by bricks, affects the normal hardening of cement, the cohesion of mortar and brick surface decreases, and the structural quality declines. The number of layers of construction mortar is controlled within 30mm, when the number of layers exceeds 30mm, the mortar is easy to produce water leakage, the number of layers or the loss of water is too fast, etc., which is inconvenient to apply the working wheel, but the number of layers is too small, and the mortar is dry and thick, which also affects the operation and engineering quality. Hope mine can help you <>

Do you have any other questions?

Masonry mortar is a material used to connect bricks or stones in buildings such as brick walls and stone walls. The technical properties of masonry mortar include the following aspects:

1.Compressive strength: The compressive strength of masonry mortar is an important indicator to measure its quality. High-strength illumination mortars are often used in buildings that are subjected to relatively high pressures or loads.

2.Stability: The stability of masonry is affected by the cohesion and adhesion of the mortar, so the mortar should have strong stability to ensure a reasonable connection between bricks or stones.

3.Dry shrinkage: As the mortar dries, dry shrinkage may occur. Therefore, the mortar should have relatively little dry shrinkage to avoid causing cracks and deformation.

5.Frost resistance: For construction projects constructed in cold environments, mortar rolling should have good frost resistance to avoid freezing or cracking during winter.

Answer]: a, b, c, e

Technical properties of the mortar: workability of the mortar. Mortar strength grade. Shrinkage performance. Adhesion.

The technical requirements for masonry mortar do not include: slump. Slump is a method and index for determining the workability of concrete, and in construction sites and laboratories, slump tests are usually done to determine the fluidity of the mixture, supplemented by intuitive empirical evaluation of cohesion and water retention.

Slump is a quantitative indicator to measure the degree of slump, which is used to judge whether the construction can be carried out normally.

Masonry mortar refers to the mortar of bricks, stones, blocks and other blocks into masonry. It plays the role of bonding, liner and force transfer, and is an important part of masonry. Cement mortar is suitable for masonry in humid environments and masonry with high strength requirements.

Cement-lime mortar should be used for masonry in a dry environment; The walls of multi-storey houses are generally made of cement-lime mortar with a strength grade of M5; Brick columns, brick arches, reinforced brick lintels, etc. generally use cement mortar with a strength grade of m5 m10; The brick foundation is generally made of cement mortar not less than m5; Low-rise houses or bungalows can be made of lime mortar; Simple houses can be made of lime clay mortar.

Performance metrics. Including the mix ratio of the mortar, the consistency of the mortar, the water retention of the mortar, the delamination of the mortar and the strength grade of the mortar. Mortar mix ratio - refers to the proportion between the components of the mortar according to the strength grade of the mortar and other performance requirements.

Expressed in weight ratio or volume ratio. Mortar consistency - refers to the flow properties of freshly mixed mortar under its own weight or under the application of external force.

Expressed in terms of the depth of immersion of a standard cone falling freely into the mortar. Water retention of mortar - refers to the ability of the freshly mixed mortar to maintain the uniformity of moisture in each layer of mortar during storage, transportation and use, which is measured by the degree of mortar delamination.